Board of Governors of the Federal Reserve System (U.S.), 1935-. "Subtotals and Individual Series, Not Seasonally Adjusted," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "December 15, 1969," G.12.3 Industrial Production (1969-12-15) : 6-8. https://fraser.stlouisfed.org/title/55/item/59559/toc/492505 , accessed on May 10, 2024.